<imgsrc="equation.png"alt="An equation which describes the average wind velocity of an unlaiden swallow. The equation is available after this image."><mrow><apply><eq/><apply><plus/><apply><power/><ci>x</ci><cn>2</cn></apply><apply><times/><cn>4</cn><ci>x</ci></apply><cn>4</cn></apply><cn>0</cn></apply></mrow>